Not classical. Most of his major works are romantic to the bone, the classical forms and some composing techniques prevail just like their prevailed in music of Schumann and Mendelssohn, hardly classical composers, to greater degree for sure - after all, he was from much older generation. Doesn't change anything though, classical mastership doesn't interfere with his essentially romantic qualities in any way. Listen to E Flat Major piano concerto (Liszt's favoruite), Der Freischutz, piano trio or some collection of his overtures.